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Normaaljaotuse korral jääb vahemikku «math xmlns=¨http://www.w3.org/1998/Math/MathML¨»«mover»«mi»x«/mi»«mo»§#175;«/mo»«/mover»«mo»§#177;«/mo»«mn»2«/mn»«mi»§#963;«/mi»«/math» kõikidest väärtustest ligikaudu